package cc.openhome;

import java.util.*;

public class Average3 {
    public static void main(String[] args) {
	Scanner console = new Scanner(System.in);
	double sum = 0;
	int count = 0;
	while (true) {
	    try {	
		int number =  console.nextInt();
		if (number == 0) {
		    break;
		}	
		sum += number;
		count++;	
	    } catch (InputMismatchException ex) {
		System.out.printf("略过非整数输入：%s%n", console.next());
	    }
	}
	System.out.printf("平均%.3f%n", sum / count);
    }
}
